Yes, the word for "tree" in French is "arbre," which is masculine. In French, nouns are gendered as either masculine or feminine, and "arbre" does not have a feminine form. Thus, it would be incorrect to refer to "tree" as feminine in French.
There are very few tree names that are feminine in French. Two of them are l'aubépine (the hawthorn) and l'yeuse (quercus ilex, the evergreen Holm oak / holly oak).
"Espagne" is feminine in French.
"Faculté" is feminine in French.
It is feminine.
"L'Autriche" is feminine in French.
La photo ("the photo") is feminine in French.
Explication is a feminine noun in French.
Oreille is a feminine noun in French.
Asie is a feminine noun in French.
In French, "marron" can be either masculine or feminine depending on its usage. As a color, "marron" is invariable and does not change for gender. However, when referring to a chestnut (as in the food), it is masculine ("un marron"), while when referring to a chestnut tree, it is feminine ("une marronne").
'une information' is a feminine noun in French.
"lentille" is a feminine noun in French.